Rent Vs Buy Calculator

The useful comparison is not rent against the mortgage payment, because most of a mortgage payment in the early years is not a cost at all - principal repayment moves money from one pocket to another. What economists call the user cost of owning is the unrecoverable part: mortgage interest, property tax, insurance, maintenance and depreciation, less expected appreciation. This model applies conventional defaults of 1.2 percent of value per year for property tax, 0.5 percent for insurance and 1 percent for maintenance, and amortizes the loan month by month so that interest and principal separate correctly as the balance falls. Renting has its own unrecoverable cost: the rent itself, less the return the down payment earns while it stays invested, modeled here at 7 percent per year. Because buying carries large one-time frictions, the two paths cross rather than one dominating from the start, and the crossing point is the break-even year - commonly three to seven years in US markets. Practitioners often screen with the price-to-rent ratio, dividing purchase price by annual rent: under about 15 tends to favor buying, above about 21 tends to favor renting. The main caveats are that appreciation is an assumption and not a guarantee, that leverage magnifies both directions, and that closing costs, agent commissions on sale, HOA dues, PMI below 20 percent down and mortgage-interest deductions are not modeled here.

Treating a house as an asset with a measurable annual cost of ownership rather than simply a monthly bill is a relatively modern framing. The user cost approach entered mainstream economics through work on housing as an investment good in the early 1980s, notably Ann Dougherty and Robert Van Order in 1982 and James Poterba's 1984 Quarterly Journal of Economics paper analyzing owner-occupied housing in an asset-market framework. That literature established the point this calculator is built on: what an owner really pays each year is interest, taxes, insurance and upkeep net of expected capital gain, not the nominal payment. Measuring the appreciation side required better price data. Karl Case and Robert Shiller developed a repeat-sales home price index in the 1980s, published in 1987, which became the Case-Shiller index and was adopted by Standard and Poor's in 2002. Its record of the 2006 to 2012 national decline made clear that appreciation could be negative for years at a time, and rent-versus-buy analysis afterward became far more cautious about growth assumptions. The interactive form most readers now recognize dates from the same period, notably the New York Times rent-versus-buy tool published in 2014, which popularized break-even framing and sensitivity to a handful of adjustable assumptions.